. Handbook of mental examination methods. cm. long. Uprights of black card-board, having .5 cm. white squares, are glued at right angles tothe ends of A and B respectively, and the strips A and B arepinned together at C in such a way that G is about 2 to 3 C than is F. On A a pasteboard protractor D is glued,and a slit (E) is cut in B so that the circular divisions on D maybe readily seen. The perimeter is used as follows: place the end H upon thebridge of the nose so that the eye to be tested is in a line withthe card F; have the patient close the other eye; move the arm Bso th
. Handbook of mental examination methods. cm. long. Uprights of black card-board, having .5 cm. white squares, are glued at right angles tothe ends of A and B respectively, and the strips A and B arepinned together at C in such a way that G is about 2 to 3 C than is F. On A a pasteboard protractor D is glued,and a slit (E) is cut in B so that the circular divisions on D maybe readily seen. The perimeter is used as follows: place the end H upon thebridge of the nose so that the eye to be tested is in a line withthe card F; have the patient close the other eye; move the arm Bso that it is on the temporal side of the eye and at an angle of90 degrees with A. Instruct the patient to look steadily at thespot on F and inform you when the spot on G is also seen. MoveB inwards until the patient reports having seen the spot on the circular degrees. Repeat for the nasal, and for theupper and lower fields. In the use of this instrument, the resultsin circular degrees are not exact, on account of the position of the. Fig. 2. Simple perimeter. A and B, arms; G and F, cardholders; D, pro-tractor; E, opening for observing scale of protractor. pivoting of the arm B. The accuracy is, however, sufficient forthe detection of constructions of the field which are of diagnosticimportance. For a more careful mapping of the visual fields theuse of a more expensive perimeter is necessary. (c) Color Vision.—In normal people colors are not usuallysensed with parts of the retina (the extreme periphery), or they 22 MENTAL EXAMINATION METHODS are sensed only as gray; with other parts the red and green arenot sensed; and with the central portion all the colors are people differ, however, in their ability to see the colors atthe extremes of the spectrum with the central as well as with theperipheral portions of the retina and there are, therefore, normalslight differences. A marked deviation from the normal colorsense is to be found in individuals otherwise nor
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